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A force can cause an object with mass to change its velocity.

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Rapidity in moving, going, traveling, proceeding, or performing; swiftness; celerity.

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A vehicle's capacity to gain speed within a short time.

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The action or process of moving or being moved.

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A basis or standard for evaluation, assessment, or comparison; a criterion.

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Balance forces are two forces acting in opposite directions on an object, and equal in size.

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The Net force is the overall force acting on an object.

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Average speed can be viewed as the rate of change in distance with respect to time.

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Static friction is a force that keeps an object at rest. It must be overcome to start moving the object.

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Kinetic friction is a force that acts between moving surfaces.

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The resistance that one surface or object encounters when moving over another.